PP Pleated Micropore Filter Cartridge for Liquid Fine Filtration
Introduction:The PP pleated micropore filter cartridge is a high-efficiency surface filter element widely used in fine liquid purification. It is normally installed inside water filter housing and forms a multi-stage filtration system with self-cleaning filter to remove fine particles after coarse filtration. It is manufactured from food-grade polypropylene raw material by melt-blown and pleating technology, featuring uniform pore distribution, high filtration efficiency and excellent chemical compatibility. It is widely used in chemical, petrochemical, food, beverage and pharmaceutical industries. This article covers its working principle, structural composition, core advantages, technical specifications, application scenarios and selection guidance, helping overseas buyers confirm whether this pleated filter cartridge matches their precision filtration projects.
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Product Introduction
The PP pleated micropore filter cartridge is a tubular precision filter element made of non-toxic and odorless polypropylene pellets through melting, spinning, drawing and forming. It is commonly placed inside water filter housing and matched with self-cleaning filter in multi-stage filtration lines. The upstream self-cleaning filter removes large debris in advance to avoid premature clogging of the delicate PP pleated media. The filter medium adopts pleated structure, which greatly expands the effective filtration area. Its pores are evenly distributed, and the inner layer has smaller pores while the outer layer has larger pores. This special gradient structure enhances dirt holding capacity and delays blockage. The raw material is pure polypropylene, so it can resist strong acid, strong alkali and organic solvents. It has high filtration efficiency, long service life and competitive cost. It can even withstand 126°C steam sterilization for sanitary-grade applications, which makes it a preferred choice for food, beverage and pharmaceutical liquid polishing filtration. Unlike depth-type string wound cartridges, this pleated cartridge delivers stable high-precision surface filtration with over 99% particle removal efficiency, suitable for the final polishing stage of liquid treatment.
Working Principle
The PP pleated micropore filter cartridge adopts surface filtration combined with gradient pore interception. Liquid flows radially from the outer surface of the pleated filter layer toward the inner core. The folded pleats provide a large effective filtration area. Large suspended particles are intercepted on the outer surface of the pleated medium, while fine particles are trapped by the inner dense micropores. The gradient pore structure (outer large, inner small) prevents rapid surface blinding and improves the overall contaminant holding capacity. The rigid inner support core supports the pleated medium and prevents deformation under differential pressure. When the pressure difference between the inlet and outlet rises to the preset value, the cartridge is fully loaded and needs to be replaced. In a complete filtration system, the PP pleated cartridge is installed in water filter housing. A self-cleaning filter is usually arranged upstream as the pre-filter to intercept large impurities and protect the pleated filter media from scratching and fast clogging. This two-stage combination can extend the service cycle of the PP pleated cartridge and reduce replacement frequency.
Main Structure
Pleated PP Filter Medium:
The core filtration layer, formed by folding polypropylene microporous membrane, provides huge filtration area and uniform micropores.
Inner Support Core:
Polypropylene porous core, provides mechanical support, prevents filter medium collapse under pressure.
End Caps & Sealing Rings:
PP end caps with EPDM / silicone O-rings, achieve tight sealing inside water filter housing and prevent liquid bypass.
Outer Protection Cage (Optional):
PP outer cage, protects the pleated medium from damage during installation and handling.
Core Advantages
Ultra-high Filtration Efficiency:
Uniform micropore density, filtration efficiency reaches more than 99% for target particles, stable precision performance.
Large Flow & Low Resistance:
Pleated structure maximizes filtration area, lower flow resistance, can handle large liquid flow with small pressure drop.
High Dirt Holding Capacity:
Gradient pore design (outer pores larger, inner smaller), holds more contaminants, extends service life and reduces replacement cost.
Excellent Chemical Resistance:
Pure polypropylene material, compatible with strong acid, strong alkali and most organic solvents.
High Sanitary Performance:
Non-toxic, no secondary pollution to liquid, can resist 126°C online steam sterilization, suitable for sanitary food and pharmaceutical processes.
High Mechanical Strength:
The cartridge will not deform even when the pressure difference exceeds 0.4 MPa, and maintains stable filtration performance under 90°C.
Standard Universal Size:
Compatible with mainstream water filter housing in the market, easy to install and replace.
Technical Specification Table
| Item | Parameter |
|---|---|
| Filtration Rating | 1μm, 3μm, 5μm, 10μm, 20μm, 30μm, 60μm |
| Material | Polypropylene (PP) |
| Steam Sterilization Condition | 126°C, 30 minutes |
| Endotoxin Level | Less than 0.5 EU/mL (IAL test) |
| Max Differential Pressure | 0.4 MPa |
| Max Working Temperature | 90°C |
| Standard Length | 10", 20", 30", 40" |
| Sealing Options | Silicone, EPDM |
Application Scenarios
Chemical & Petrochemical Industry:
Filtration of weakly corrosive materials such as water, ammonia, oil and hydrocarbon; filtration of corrosive media including caustic soda, soda ash, dilute sulfuric acid, acetic acid and ester liquid.
Refrigeration Industry:
Filtration of low-temperature materials such as liquid methane, liquid ammonia, liquid oxygen and various refrigerants.
Food & Beverage Industry:
Polishing filtration of beer, drinking water, beverages, dairy products and syrup.
Pharmaceutical Industry:
Pre-filtration and final polishing of injection liquid, medicinal agents and pharmaceutical raw liquid, meeting endotoxin control requirements.
Water Treatment:
RO system pre-filtration, pure water and ultra-pure water polishing filtration, matched with water filter housing and self-cleaning filter.
Other Industries:
Electroplating liquid, coating, ink and fine chemical liquid filtration.
Buying & Selection Guide
When selecting a PP pleated micropore filter cartridge, buyers need to confirm filtration accuracy, operating temperature, liquid pH, flow rate, sanitary requirement and the size of water filter housing. For sanitary processes such as beer and pharmaceutical injection, select the steam-sterilizable grade and request endotoxin test reports. For high-contamination raw liquid, install a self-cleaning filter upstream as pre-treatment to protect the pleated filter media. If the medium is strong oxidizing liquid, we will recommend other filter material instead of PP. We can supply different end connections and sealing materials to match your filter housing.
FAQ
Q1: What is the difference between PP pleated filter cartridge and melt blown filter cartridge?
A: PP pleated cartridge has much larger filtration area, higher flow rate and higher filtration efficiency, used for fine polishing filtration. Melt blown cartridge is a depth filter with higher dirt holding capacity, usually used for primary pre-filtration.
Q2: Can this PP pleated cartridge be reused after cleaning?
A: It is disposable. Once the micropores are blocked by fine particles, cleaning cannot fully restore the filtration performance, so replacement is required.
Q3: Is it suitable for hot liquid?
A: The maximum continuous working temperature is 90°C. It can accept intermittent steam sterilization at 126°C for sanitary disinfection.
Q4: How to match with water filter housing?
A: Confirm the cartridge length and interface type. Our standard PP pleated cartridges fit most common 10–40 inch filter housings.
Q5: Why configure a self-cleaning filter before the pleated cartridge?
A: The self-cleaning filter removes large suspended solids and debris, avoids scratching the delicate pleated PP medium and greatly extends the service life of the pleated cartridge.
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